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Combine flour, baking powder, salt and baking soda in a medium bowl and mix well.
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Stir in vegetable oil.
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Add buttermilk and stir until just blended.
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Knead the dough on a lightly floured surface until smooth.
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roll dough into a 15x8" rectangle.
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Preheat oven to 400 degrees.
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Grease a 9" round baking pan lightly.
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Spread butter over the dough.
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Combine sugar and cinnamon in small bowl and mix well.
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Sprinkle over butter.
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Roll up rectangle, jelly roll fashion, starting from one long side.
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Pinch seam to seal.
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Cut the roll into 1 1/2 inch slices.
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Arrange the slices, cut side up in prepared baking pan.
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Bake until lightly browned, about 15-20 min.
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Remove from oven.
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Pour milk over the top if desired.
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Serve hot.